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J. N. MGINTIRE.

I E TELEPHONE. No; 308,273. Patented Nov. 18, 1884.

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JACOB N. MOINIIRE, OF NEYVYORK, N. Y.

TELEPHONE.

SPECIPICATICN forming part of Letters Patent No. 308,273, dated November 18, 1884.

' Application filed September 18, 1884. (X0 model.)

To all whom it may concern:

Be it known that I, J noon N. MCINTIRE, of New York city, in the county of New York and State of New York, have invented certain new and useful Improvements in Telephones; and I do hereby declare that the following is a full, clear, and exact description thereof, reference being had to the accompanying drawings, making part of this application.

My invention relates to an improved mode or method ofworking telephonic transmitters; and it has for its main object to provide for use a method of and means for operating such transmitters which will be quite as efficient as or more effective than the heretoforeknown method and means, so far as capacity in the telephone to perfectly transmit articulate speech is concerned, and which will at the same time overcome in practice an evil that is naturally attendant upon the usual mode of and means for operating telephones viz., the constant liability to undue disturbance in the diaphragm or other vibratory de vice of the transmitter by noises extraneous to the speech of the person using the instrument.

To this main end and object my invention consists in working a telephone of any known type or construction through the medium of a column or body of confined air acted upon by such exterior portions of. the body of the speaker (preferably the outer portion of the throat in the vicinity of the larynx) as possess the capacity of imparting to any body in contact therewith the sound-vibrations of articulate speech.

It is not new with me, nor is it apart of my invention, to conduct the sounds of the human voice to the car of a listener through the me dium of astethoscope, (either solid or tubular,) arranged with one end against the exterior of the throat of the speaker and the other close to the ear of a listener, and acting on the electrodes of the telephone or on the armatures or diaphragm of a magneto-telephone, this method of hearing the sounds of the human voice being defined as laryngophony. I have applied this well-known principle to the art of telephony by the utilization of a column or body of confined air acting as a conductor between the exterior of the throat and the diaof the known principle of the conduction of the sounds of the human voice from the exterior of the throat any apparatus or contrivance may be employed embodying a suitable speaking telephonic apparatus provided with means by which a proper communicatlon may be established, through the medium of confined air, between the diaphragm (or other vibratory or pulsatory device) of the transmitter and the exterior of the throat of the person speaking to the telephone.

To enable those skilled in the art to perfectly understand and practice my invent-ion, I will now proceed to more fully explain the same in that form in which I have so far practically tested it, and which is the best form now known to me, though I wish it to be distinctly understood that other and perhaps better means for carrying into effect my in'iprovementin the art may be devised and will doubtless be suggested by those skilled in the art, and who, unlike myself, may be skilled electricians.

In the accompanying drawings, forming part of this specification, I have shown a telephonic apparatus adapted to carry into operative effect my invention.

At Figure l I have shown in vertical sec tional elevation an ordinary telephonic transmitter, substantially such as now very generally in use, supplementedwith means necessary to the practicing of my invention.

The means shown for rendering this form of transmitter capable of working according to my invention is a tube, A, properly connected at its inner end to the transmitter-box front B, and provided at its outer end with a sort of flared throat-piece or concentrator, O, the usual boxcover or lid, B, being formed or provided with a tubularorifice at E, (from which extends outwardly the tube A, as shown,) instead of having the commonly-employed flaring mouth-opening usually talked. into by the speaker.

I have used flexible tubes of rubber, in practicing my invention, Varying in length from twelve to twenty inches, andhave with such means, crudely applied, gotten acceptable results; but it may be found desirable to employ rigid tubes of some other material, in which case the tube, in lieu of being separate from the wooden or other front, B, of the transmitter-box, may be formed integral therewith.

At Fig. 2 I have shown a modified form of apparatus, in which (in another form of transmitter) a rigid tube, A", is formed integrally with the cover 13* of the case.

Other'modifications and many substantial changes in apparatus may suggest themselves, especially in the minds of those more familiar with and experienced in the science of electricity and the art of telephony than myself, in practicing my improvement in the art.

It is preferable, I believe, to have the apparatus so constructed that when the device 0 shall be applied to the throat the tube containing the body of conducting air shall be nearly or quite air-tight; but this is not indispensable to the working of the apparatus.

Having now so explained the nature of my said improvement in the art, and so shown and described the best means now known to me for carrying out my invention, that those skilled in the art of telephony can practice said invention, what Iclaim as new, and desire to secure by Letters Patent, is-

The hereinbefore set forth mode or method of operating telephones, which consists, es sentially, in communicating to the diaphragm (or other equivalent device for varying the condition of the electric current) through the medium of a column or body of confined air the sounds of the vocal organs derived from the exterior of the throat.

In witness whereof I have hereunto set my hand this 30th day of August, 1884.

v J. N. MCINTIRE. In presence of- JACOB FELBEL, F. H. J ONES. 

